Yes, but this evidence does not necessarily say very much about language and the relationship between language and thought. For example, if a culture does not teach their children to swim and therefore the culture at large does not know how to swim, those people could still swim, albeit slowly. Does this say anything about their bodies? No. If some sort of conditioning by one's culture is required to distinguish colours (which seems to be the case), this is very interesting, but it says very little about language.